This Twenty Questions: The Hundred Chart lesson plan also includes:
Use the 20 Questions game to practice math vocabulary and number properties! Project a hundreds chart and hand one out to learners. Ideally, give them counters (beans would work well) to mark off the chart so you can play multiple times. You choose a number, and they ask yes or no questions to figure it out in less than 20 questions. As they get answers, they use deductive reasoning to omit numbers. Your class could also do this in pairs.